@article{church40,
  author	= "Alonzo Church",
  title		= "A Formulation of the Simple Theory of Types",
  journal	= "Journal of Symbolic Logic",
  year		= 1940,
  volume	= 5,
  pages		= "56-68"}

@TechReport{Gordon:1985:HOL,
  author =       {M. J. C. Gordon},
  title =        {{HOL}: A machine oriented formulation of higher order logic},
  institution =  {University of Cambridge Computer Laboratory},
  year =         1985,
  number =       68
}
